CVE-2025-2857

Name: CVE-2025-2857
Creator: NVD / NIST
Published: 2025-03-27T14:15:55.72+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 10/10EPSS 1.87%

Last modified Jun 17, 2026

CVE-2025-2857 is a critical-severity vulnerability rated 10/10 on the CVSS scale. Following the recent Chrome sandbox escape (CVE-2025-2783), various Firefox developers identified a similar pattern in our IPC code. A compromised child process could cause the parent process to return an unintentionally powerful handle, leading to a sandbox escape. EPSS estimates a 1.87% chance of exploitation in the next 30 days.

Description

Following the recent Chrome sandbox escape (CVE-2025-2783), various Firefox developers identified a similar pattern in our IPC code. A compromised child process could cause the parent process to return an unintentionally powerful handle, leading to a sandbox escape. The original vulnerability was being exploited in the wild. *This only affects Firefox on Windows. Other operating systems are unaffected.*. This vulnerability was fixed in Firefox 136.0.4, Firefox ESR 128.8.1, and Firefox ESR 115.21.1.

Metrics

CVSS 3.1

10/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS Probability

1.87%

76.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-668

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 136.0.4
Mozilla	Firefox	< 115.21.1
Mozilla	Firefox	>= 128.1.0, < 128.8.1

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1956398Permissions Required
https://issues.chromium.org/issues/405143032Permissions Required
https://www.cve.org/CVERecord?id=CVE-2025-2783Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2025-19/Vendor Advisory

Timeline

Published: Mar 27, 2025
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2025-2857?

How severe is CVE-2025-2857?

CVE-2025-2857 has a CVSS score of 10/10 (CRITICAL severity). The EPSS model estimates a 1.87% probability of exploitation in the next 30 days.

How do I fix CVE-2025-2857?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-2857?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST